<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<button onclick="Click()">这是一个弹窗</button>
</body>
<script type="text/javascript">
    function Click() {
        let name = prompt("请输入姓名：");
        let parent = document.querySelector("body");
        let child = document.createElement("div");
        child.innerHTML = name;
        parent.appendChild(child)
    }
</script>
</html>